Brush-holder.



No. 762,074. PATENTED JUNE 7, 1904'. E. s. LUETH & 0. D. KNIGHT.

BRUSH HOLDER.

APPLICATION FILED MAR. 21. 1904.

N0 MODEL-v @Wmwgw.

'No. 762,074. Patented June 7, 1904.

UNITED STATES PATENT OEEIcE.

EMIL S. LUETI-I, OF BARABOO, AND CHARLES D. KNIGHT, OF MILIVAUKEE,

IVISCONSIN, ASSICNORS' TO NATIONAL ELECTRIC 'COAIIANY, ()F MIL- VAUKEE, \VISCONSIN, A CORPORATION OF IYISCONSIN.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 762,074, dated June 7, 1904.

Application filed March 21, 1904, Serial No. 199,122. [No model.)

whom it y concern" which it is inserted at one end and bearing at Be it known that we, EMIL S. LUETH, rethe other end against the arm r/. siding at Baraboo, in the county of Sauk, and j is an arm, preferably of bail shape, en- CHARLES D. KNIGHT, residing at Milwaukee, gaged at the ends with the protruding ends 5 in the county of Milwaukee, State of Visconof the pin 71 one of which is squared, as shown sin, citizens of the United States, have invent in Figs. 2 and 3, to prevent it from turning ed certain new and useful Improvements in therein. Brush-Holders, of which the following is a l? is a knurled eccentric or friction grip 55 specification, referencebeing had to the aceccentrically journalcd or pivoted between I0 companyingdrawings,formingapart thereof. the branches of the arm j on a pin parallel This invention relates more particularly to with the pin h. The ears (3 are rounded condevices for adjusting the springs by which centrically with the pin l). and are knurled on the brushes are held against the commutators their edges to provide a more secure hold for 60 of electric motors or generators. Its main the eccentric or grip I 5 objects are to facilitate the adjustment of the The arm r may be dispensed with and the tension-spring and to provide for very slight spring 7' made to bear directly at one end variations in tension. against the brush (Z, as shown in Fig. 4. The

It consists in certain novel features of conother end of the spring is secured in the split 6 5 struction and in the peculiar arrangement of pin Z1, and its tension is adjusted by a bailparts hereinafter particularly described and shaped arm carrying an eccentric or eccenclaimed. trically-pivoted friction-grip Z, as shown in In the accompanying drawings like letters the other figures and hereinbefore described. designate the same parts in the several ig- To adjust the tension of the spring in either 70 ures. case, the eccentric or grip Z' is turned by the Figure 1 is a longitudinal section on the line thumb and linger of the operator out of en- 1 1, Fig. 2, of a brush-holder embodying our gagement with the knurled edges of the ears invention. Fig. 2 is a partial plan view and c. The arm 7' is then swung up or down to ina partial section on the line 2 2, Fig. 1. Fig. crease or diminish the tension and is secured 75 3 is a side elevation of a part of the brushin the desired position by turning the eccen- 0 holder, showing the spring-adjusting device; tric or grip back into engagement with the and Fig. 4 is a side elevation and section of a ears 0. The eccentric or grip is released from slightly-modified form of the brush-holder. the ears 0 by slightly lifting the arm 7'. hen

The body of the holder consists of a metal it is engaged with said ears to lock the arm case or sleeve (1, open at the ends and formed in position, its bite against the knurled edges 3 5 on one side with a split collar 6 and on the of the ears 0 is tightened by the force of the opposite side with ears 0. The brush-carbon spring. tending to swing the arm j down (Z is fitted to slide freely endwise in the sleeve ward. or case a. The collar Z) is provided with a Various changes in details of construction. 5 clamping-screw 0, by means of which it is ad particularly as to those parts of the holder 40 justably secured on a stud f in the usual way. which do not affect the tension device, may A forked arm 1 is pivoted at its forked end he made without departing from the principle between the ears 0 on a partially-split pin 71,, and intended scope of our invention.

which projects atits ends through and is adapt- IV e claim 9 ed to turn in holes in said ears. At its free 1. In a brush-holder the combination with end the arm g is adapted to bear against the the body in which the brush is adapted to outer end of the brush (Z. move endwise, a tension-spring for holding 2' is a spring coiled around the pin it, in the brush with yielding pressure against the commutator, a pin to which one end of the spring is attached journaled in a projection on said body, an arm secured to said pin, and a friction-grip eccentrically pivoted to said arm and adapted to be engaged with said projection, substantially as described.

2. In a brush-holder the combination with the body of the holder in which the brush is movable endwise, of a pin journaled in said body, a spring for holding the brush with yielding pressure against the commutator, coiled around and. attached at one end to said pin, an arm secured to said pin, and a friction-grip adjustably pivoted to said arm and adapted to be engaged at different points with a curved face on said holder, concentric with said pin, substantially as described.

. 3. In a brush-holder the combination with the body of the holder in which the brush is movable endwise and which is formed with semicircular cars, a pin journaled in said ears concentric with their curved edges, a tensionspring attached at one end to said pin between said ears, a bail-shaped arm engaged with the ends of said pin, and a friction-grip eccentrically pivoted between the branches of said arm parallel with said pin and adapted to be turned into and out of engagement with the curved edges of said ears, substantially as described.

4. In a brush-holder the combination with the body of the holder having a pair of rounded ears on one side, a pin journaled in said ears, a forked arm pivoted at its forked end between said ears on said pin, a spring attached at one end to said pin and bearing at the other against said arm, an arm attached to said pin and a friction-grip eccentrically pivoted to the second arm and adapted to be turned into and out of engagement with the curved edges of said ears, substantially as described.

5. In a brush-holder the combination with the body of the holder having an open-ended case or sleeve in which the brush is movable endwise, and a pair of perforated ears with curved edges concentric with the perforations, a split pin passing loosely through the perforations in said cars, a forked arm loosely pivoted at its forked end on said pin between said ears and adapted to bear at its other end against the outer end of the brush, a spring coiled around said pin and secured at one end therein and bearing at the other end against said arm, a bail-shaped armengaged with the ends of said pin outside of said ears, and a friction-grip eccentrically pivoted between the branches of the second arm in position to be turned into and out of engagement with the adjacent edges of said ears, substantially as described.

In witness whereof we hereto aifix our signatures each in presence of two witnesses.

EMIL S. LUETH. CHARLES D. KNIGHT. I/Vitnesses as to E. S. Lueth:

J. WV. CARow, E. F. DITHMAR. Witnesses as to U. D. Knight:

OIiAs. L. Goss, BERNARD 0. RoLoFF. 

